@import url("https://fonts.googleapis.com/css2?family=Quicksand&display=swap");
:root {
  --card-width-lg: 157px;
  --card-height-lg: 220px;

  --card-width-sm: 120px;
  --card-height-sm: 168px;

  --num-cards: 4;

  --card-horizontal-space-lg: 100px;
  --card-horizontal-space-sm: 50px;

  --primary-font: "Quicksand", sans-serif;
}
body {
  height: 100vh;
  font-family: var(--primary-font);
}

main {
  height: 55%;
  display: flex;
  justify-content: center;
}

.card-container {
  position: relative;
  height: 100%;
  width: calc(
    var(--card-width-lg) * (var(--num-cards) / 2) +
      var(--card-horizontal-space-lg)
  );
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 1fr 1fr;
  grid-template-areas:
    "a b"
    "c d";
}

.card-pos-a {
  grid-area: a;
  /* background-color: gray; */
}
.card-pos-b {
  grid-area: b;
  /* background-color: goldenrod; */
}
.card-pos-c {
  grid-area: c;
  /* background-color: rosybrown; */
}
.card-pos-d {
  grid-area: d;
  /* background-color: darkcyan; */
}
.card-pos-a,
.card-pos-b,
.card-pos-c,
.card-pos-d {
  display: flex;
  justify-content: center;
  align-items: center;
}

.card {
  position: absolute;
  height: var(--card-height-lg);
  width: var(--card-width-lg);
  perspective: 1000px;
  cursor: pointer;
  transition: transform 0.6s ease-in-out;
}
.card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  text-align: center;
  transition: transform 0.6s;
  transform-style: preserve-3d;
}
.card-front,
.card-back {
  position: absolute;
  width: 100%;
  height: 100%;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
}
.card-img {
  height: 100%;
}
.card-back {
  transform: rotateY(180deg);
}
.card-inner.flip-it {
  transform: rotateY(180deg);
}
header {
  display: flex;
  flex-direction: column;
  margin-bottom: 10px;
}
.header-title-container {
  display: flex;
  justify-content: center;
}
.header-round-info-container {
  display: flex;
  justify-content: space-evenly;
}
.current-status {
  font-size: 1.5rem;
  text-align: center;
}

.header-status-info-container,
.header-button-container,
.header-score-container,
.header-round-container,
.header-img-container {
  display: flex;
  justify-content: center;
  align-items: center;
}

.header-score-container,
.header-round-container,
.header-img-container {
  width: 150px;
}
.header-img {
  height: 75px;
  border-radius: 5px;
  border: 1px solid black;
  padding: 5px;
  box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2);
  transform: rotate(-3deg);
}
.badge {
  background-color: var(--badge-bg-color);
  background-color: gray;
  color: #ffffff;
  padding: 2px 10px 3px;
  border-radius: 15px;
}
.game-play-button-container {
  width: 150px;
  height: 70px;
}

/* CSS */
#playGame {
  appearance: none;
  background-color: transparent;
  border: 2px solid #1a1a1a;
  border-radius: 15px;
  box-sizing: border-box;
  color: #3b3b3b;
  cursor: pointer;
  display: none;
  font-family: var(--primary-font);
  font-size: 16px;
  font-weight: 600;
  line-height: normal;
  margin: 0;
  min-height: 60px;
  min-width: 0;
  outline: none;
  padding: 16px 24px;
  text-align: center;
  text-decoration: none;
  transition: all 300ms cubic-bezier(0.23, 1, 0.32, 1);
  user-select: none;
  -webkit-user-select: none;
  touch-action: manipulation;
  width: 100%;
  will-change: transform;
  animation: game-play-button-fade-in 10s 1;
}

#playGame:disabled {
  pointer-events: none;
}

#playGame:hover {
  color: #fff;
  background-color: #1a1a1a;
  box-shadow: rgba(0, 0, 0, 0.25) 0 8px 15px;
  transform: translateY(-2px);
}

#playGame:active {
  box-shadow: none;
  transform: translateY(0);
}

@keyframes game-play-button-fade-in {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

.card.shuffle-left {
  transform: translateX(300px) translateY(40px);
}
.card.shuffle-right {
  transform: translateX(-350px) translateY(-40px);
}
.card.fly-in {
  transform: translateY(-1000px) translateX(-600px) rotate(45deg);
}

@media screen and (max-width: 600px) {
  .card {
    width: var(--card-width-sm);
    height: var(--card-height-sm);
  }
  .card-container {
    width: calc(
      var(--card-width-sm) * (var(--num-cards) / 2) +
        var(--card-horizontal-space-sm)
    );
  }
  main {
    height: 50%;
  }
  .current-status {
    font-size: 1.2rem;
  }
  .game-play-button-container {
    width: 120px;
    height: 40px;
  }
  #playGame {
    padding: 6px 8px;
    font-size: 12px;
    min-height: 40px;
  }
  .header-img {
    height: 55px;
  }
}